Process: Fix communication with zygote. am: e29c6493c0
am: 1bd43c162f
Change-Id: Ic38c43db48584b3d899e120fd65a4058d806a39f
diff --git a/core/java/android/os/Process.java b/core/java/android/os/Process.java
index 21a9904..1029731 100644
--- a/core/java/android/os/Process.java
+++ b/core/java/android/os/Process.java
@@ -537,6 +537,15 @@
ZygoteState zygoteState, ArrayList<String> args)
throws ZygoteStartFailedEx {
try {
+ // Throw early if any of the arguments are malformed. This means we can
+ // avoid writing a partial response to the zygote.
+ int sz = args.size();
+ for (int i = 0; i < sz; i++) {
+ if (args.get(i).indexOf('\n') >= 0) {
+ throw new ZygoteStartFailedEx("embedded newlines not allowed");
+ }
+ }
+
/**
* See com.android.internal.os.ZygoteInit.readArgumentList()
* Presently the wire format to the zygote process is:
@@ -553,13 +562,8 @@
writer.write(Integer.toString(args.size()));
writer.newLine();
- int sz = args.size();
for (int i = 0; i < sz; i++) {
String arg = args.get(i);
- if (arg.indexOf('\n') >= 0) {
- throw new ZygoteStartFailedEx(
- "embedded newlines not allowed");
- }
writer.write(arg);
writer.newLine();
}
@@ -568,11 +572,16 @@
// Should there be a timeout on this?
ProcessStartResult result = new ProcessStartResult();
+
+ // Always read the entire result from the input stream to avoid leaving
+ // bytes in the stream for future process starts to accidentally stumble
+ // upon.
result.pid = inputStream.readInt();
+ result.usingWrapper = inputStream.readBoolean();
+
if (result.pid < 0) {
throw new ZygoteStartFailedEx("fork() failed");
}
- result.usingWrapper = inputStream.readBoolean();
return result;
} catch (IOException ex) {
zygoteState.close();